BJP dropped sitting MP Poonam Mahajan as its Mumbai North Central candidate and replaced her with Ujjwal Nikam. The decision to drop Mahajan was based on organisational feedback after several poll surveys showed a negative rating for her. Some leaders also claimed that the decision was taken some time back, but the party's search for her replacement took time.
https://www.hindustantimes.com/india-news/meet-ujjwal-nikam-bjp-lok-sabha-candidate-who-cooked-up-biryani-story-to-nail-ajmal-kasab-101714219227094.html